Combustion apparatus



3nventoxs L5. ea gan Filed June 29, 1944 L. S. REAGAN ETALCOMBUSTIONAPABATUS Oct. 16, 1945.

Patented Oct. 16, 1945 UNITED. sMTE r COMBUSTION APPARAIUS LochS.'Reag*afi and John c. Wallis, Tulsa, Okla.', assignors to VebsterEngineering Company, Tulsa, Okla., a corporation of Delaware.Application June 29, 1944, Serial No. 542,679

3 Claims.

The present invention relates to gas burners of the type embodying amulti-ported burner block in a draft duct. Burners of this type havespecial utility in connection with steam boiler furnaces but asheretofore designed have been subject to the drawback that fiamepulsations readily occur in the fumace firebox. The object of thepresent invention is to provide an improved burner of the type indicatedwhich shall not be subject to the dificulty mentioned.

For a consideration of what is believed to be novel and our invention,attention is directed to the following specification and the claimgappended thereto.

In the accompanying drawing wherein the preferred form of the inventionis shown,

Fig. 1 shows the improved burner in partial side elevation and Verticalsection and as pitioned in a horizontal draft passage in the verticalwall of a combustion chamber.

Fig. 2 is an end elevation of the burner viewed from the right in Fig.1.

Fig. 3 is a view similar to Fig. 2 but showing the fuel nozzlesarrangq.- in a somewhat difierent pattern as regards their angularityWith respec to each other.

Figs. 4, 5 and 6 are fragmentary detail views of certain details ofconstruction.

In the drawing, l0 indicates an upright side wall of a combustionchamber of a steam boiler furnace. In this wall Il), there is ahorizontal passage 1 l wherein the burner of the present invention ispositioned te lire into the combustion space or ohamber at the right ofthe wall 10 as viewed in Fig. 1.

The improved burner comprises an air duct or casing l2 adapted to bepositioned in the passage Il. Louvres 13 in a frame l4 at the outer endof the duct control the entry of air into the duct and a multi-portedburner block [5 at the inner end of the duct divides the main air streaminto a plu rality of separate streams, the ports or apertures in theblock being indicated at 16 and being shown as of the square type and asbeing arranged in vertical and horizontal rows, this being the preferredarrangement. The burner black is made of refractory material supportedin a dished frame 11 fixedly secured to the walls of the casing 12 inany preferred way as by spot welding.

The fuel supply pipe is indicated at H! and extends into the casing l2to a transversely extend ing header l9 closed at both ends. In gasconnection with this header is a plurality of gas distribi1ting tubes20, one tube for each horizontal C.Il

row of air ports [6. As shown in Fig. 5 the tubes 20 are preferablywelded to the header l9.

Each tube 20 has a row of elongated gas nozzles 2l extending therefrom,one nozzle for each adjacent air port 16. It is important that thenozzles be maintained in predetermined fixed position with respect tothe burner block 15. A simple expedient for this purpose comprises (secFig. 4) clamp bars 22 for clamping the ends of the distributing tubes 20to vertical spacing bars 23 secured to the back of the frame 11 as byscrews 24. Clamping screw for the bars 22 are indicated at 25. As bestshown in Fig. 6, each nozzle 2l comprises a removable tip or spud 26 tofacilitate changing of the discharge area of the nozzle as the specialconditions of each burner application may require as, for example, theparticular kind of gas that is available, etc.

In the present invention, each gas nozzle 2l is so arranged with respectto the adjacent air port l6 that the gas will be fed into said port oneside only of the air stream passing through the port, the nozzle forthis purpose having its discharge end in relatively close proximity t0 aspot on the inner surface of the air port and being arranged todischarge towards said spot at a relatively small angle of incidence,the preferred angle being about 23. This manner of adding the fuel tothe air efiectively prevents fiame pulsations from occurring in thefurnace combustion chamber and may be said to constitute thedistinguishing feature of the present invention. Also by thus causingthe fuel t0 fiow in contact with the inner surface of the air port,intermixing of the fuel layer next to said surface is sufiicientlydelayed to provide in close proximity to the discharge end of saidsurface a pilet fiame Which tends to hug said end and Which, therefore,cannot be blown oi regardless of how much the rate of fiow of airthrough the,air port may vary due to varying draft conditions.

It will readily be appreciated that because the air and fuel flow sideby side in the respective air ports the combustion flame tends to .berelatively long. However, in accordance With the present invention, thelength of fiame can be varied by varying the angular pattern of thenozzles With respect to each other. 'Ihus, in Fig. 2, all of the nozzlesin any one horizontal row are shown as parallel to each other but inadjacent rows they point alternately up and clown. This particularangularity of nozzles between adjacent rows produces a fiame patternthat is shorter than would be the case if the nozzles in adjacent rowsall pointed in the same general direction as, for example, upwardly ordownwardly or sideways. A

stil1 shorter fiame pattern Wil1 resuIt if the nozz1es of eachhorizontal row point alternately in converging and diverging directions.A typical arrangement is shown in Fig. 3, it being noted that in thisfigure the nozzles point alternately in converging and divergingdirections in horizontal planes. HQWever, the planes mightjust as we llb.e vertical: r

From the foregong description it should be clear that the presentinvention provides a unique type of burner well adapted forits intendedpurpose. 7

What is claimed as new is:

1. In a burner for supplying air and fuel gas t0 a furnace chamber, thecombination of a burner block having a. multiplicity ofports throughwhich the combustion air fiows to said chamber, and a, gas dischargenozzle for each port, the discharge end of the nozzle being positionedso close to one wall of the port that the air gap therebetween isnegligible and the angle of incidence of the gas jet on said wall beings0 small that the gas jet tends to maintain its stream integ ritg for,a. substantial distance along said wall, whereby intermixing of the airand ga,s proceeds rlatively slowly in the port.

2. In the combinaticn specified in claim 1, the said angle of incidencebeing about 23.

3. In the, combination specified in claim 1, the said gas dischargenozzIes pointing in various difl5. rections with. respect to each other.

LEON S. REAGAN. JOHN C. WALLIS.

